OK so I recieved mine last week and tried to install it yesterday. Sadly it did not fit and to make matters worse, it is a custom made seat where I had to return my own
So now I'm without any seats at all which is a real bummer. I have emailed Topsellerie about the issue and expect an answer tomorrow about what to do.
The issue as I see it.
The rider seat can be installed OK
The passanger seat can be installed OK, but only if the rider seat is NOT installed.
If the rider seat is installed there doesn't seem to be enough room for the passenger seat. Not even by using force I can make it click in to the lock
I have noticed that when the rider seat is installed and locked in, I can barely get my finger down to the release lever now due to very little space. This was not an issue with the original seat leaving my to conclude that the issue is the rider seat being too "long" for the passenger seat to fit as well.